.input {
  border: 1px solid tomato;
}

.fade-enter, .fade-appear{
  opacity: 0;
}

.fade-enter-active，.fade-appear-active{
  opacity: 1;
  transition: opacity 1s ease-in;
}

.fade-enter-done{
  opacity: 1;
}

.fade-exit{
  opacity: 1;
}

.fade-exit-active{
  opacity: 0;
  transition: opacity 1s ease-in;
}

.fade-exit-done{
  opacity: 0;
}

